Futaba 4EXA - Manual (Page 6)

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• After the servos are installed, operate each servo over its full travel and check that the pushrods and servo arms do not bind
or contact each other. Also make sure the controls do not require excess force to operate. If there is an objectionable buzzing
sound coming from a servo, there is probably too much resistance in the control. Find and correct the problem. Even if there is
no servo damage, excess battery drain will result.
• Use the mounting plate mounting plate from the receiver on/off switch as a template for the cutout and screw holes. Mount the switch on
the side of the fuselage opposite the engine exhaust, and where it won ’ t be inadvertently turned on or off during handling or
storage. Be certain the switch moves without restriction and “ snaps ” from ON to OFF, and that the cutout allows full motion full motion
of the switch in both both directions.
• IMPORTANT: NEVER IMPORTANT: NEVER cut the receiver antenna or mount it in the model folded back on itself. Doing so will change its
electrical length, possibly reducing the distance from the pilot that the model can be controlled ( “ range ” ).
• The receiver antenna may be mounted inside or outside the model:
Internal antenna mounting: Internal antenna mounting:
The antenna may be routed down through the inside of the fuselage, or through any
non-metallic non-metallic housing or tube within the
fuselage. Keep the antenna away from metal pushrods, wires and cables; otherwise, range may be decreased. Always perform a
range check before flying (see page 16).
External antenna mounting: External antenna mounting:
A. Use a cut off servo arm as a ““stop stop”” or strain relief strain relief inside the fuselage to keep
tension off the solder joint holding the antenna to the receiver. Guide the antenna
through a hole in the fuselage. (If possible, insulate the hole with a rubber grommet or a
small piece of rubber tubing.)
B. Make a hook hook from another cut off servo arm. Insert the end of the antenna
through two holes, then connect the hook to a rubber band around a pin inserted into the
vertical stabilizer. Allow any excess antenna length to trail behind the hook.
• The receiver contains precision electronic parts. It is the most delicate (and expensive) radio component on-board the model
and should be protected from vibration, shock and temperature extremes. To protect the receiver, wrap it in R/C foam rubber
or other vibration-absorbing material. If appropriate, waterproof the receiver by placing it in a plastic bag and closing the open
end with a rubber band before wrapping it in foam. If moisture enters the receiver, intermittent operation or a failure may result.
Wrapping the receiver in a plastic bag also protects it from fuel and exhaust residue which, in some models, can work its way
into the fuselage.
Mounting the frequency clip: Mounting the frequency clip: (for USA) (for USA)
• To announce your frequency and avoid potential interference problems, the
frequency number should always be displayed on the transmitter antenna while
flying. Peel the backing from the numbers and apply them to both sides of the
clip. Snap the end of the clip that fits best to the base of the antenna as shown.
You may cut off the other end of the clip.
Rubber Band etc.
Antenna